Republican congressman Steve King warned President Obama on Sunday that he could face “that I-word that we don’t want to say” if he grants executive amnesty to millions of illegal immigrants, explaining that “if that’s not enough to bring [impeachment] about then I don’t know what would be.”

The Iowa lawmaker was asked by “Fox News Sunday’s” Chris Wallace about the White House’s apparent plan to “defer the deportations of millions more illegal immigrants.”

“Congressman King, if he does that — if he goes ahead and unilaterally decides to defer deportations of immigrants — what’re you gonna do about it?” he asked.

“Well, none of us want to do the thing that’s left for us as an alternative,” King began. “But if the president has decided that he’s simply not going to enforce any immigration law . . . I think Congress has to sit down and have a serious look at the rest of this Constitution.”

“And that includes that I-word that we don’t want to say,” he continued. “And I only say that now on this program because I want to encourage the president: Please don’t put America into a constitutional crisis. Please don’t do that. There’s too much at stake in this country to be deciding that you can take over the Constitution and write it at will.”

“But you’re saying that if he were to do that, then impeachment would be on the table?” Wallace pressed.

“Where would we draw the line otherwise?” King replied. “If that’s not enough to bring that about, then I don’t know what would be. We’ve never seen anything in this country like a president that says ‘I’m going to make up all immigration law that I choose, and I’m gonna drive this thing regardless of the resistance from Congress.’”